0.12.0

• Add support for mqtt 5. Set the mqtt.version property to 5 to enable.
• New mqtt.clean property to enable or disable clean sessions.
• Improved configuration mechanisms
  • Improved validation.
  • All properties are optional now.
  • Allow advanced code-based configuration. Implement one of the MqttConfigurers to use.
  • Metadata for IDEs to enable autocompletion.
• Dependency updates.